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Chemistry

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Keely Wyman

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Cards in this guide (16)
What is an endothermic reaction

An endothermic reaction is one that absorbs heat from the surroundings.

What is the difference between a Newton and a Newton Meter

"Newton" is a unit of force.

"Newton-meter" is a unit of energy. It's the energy expended by a force of one newton

acting through a distance of one meter.

Answer

A newton is the SI unit for force.

A newton metre is the SI unit for torque.

What does it mean if keq1

I suspect it could be " k eq 1" , or "k =1".

Which of the following best describes a neutralization reaction

Answer this question… Which of the following best describes a neutralization reaction? A. Acid + base H+ + OH- B. Acid + base salt + water C. Acid + base metal + nonmetal D. Acid + base H2O + H3O+

What is true of the enthalpy value of an intermediate reaction

It is multiplied by 2 if the intermediate reaction is multiplied by 2

What does a negative change in entropy indicate

The system has become more ordered.

What happens to the potential energy of the molecules in a reaction

The potential energy of the molecules change during a reaction.

What must happen for carbon dioxide to sublimate at a given pressure

Energy must transfer to the carbon dioxide from its surroundings

What is the enthalpy of reaction-

The enthalpy of a reaction is the amount of heat absorbed in the reaction.

What is the change in entropy (S) when a solid substance decomposes and produces gaseous products

no

What is the relationship between the enthalpy h and entropy s of a reaction that is spontaneous at higher temperatures but not at lower temperatures

-H, +S

What does the enthaply of reaction measure

The enthalpy of reaction is the change of the system enthalpy after a chemical reaction.

What variable represents thermal energy in the equation Q mc T

Q is the symbol of heat.

What happens to water when thermal energy is transferred to it

It gets warmer.

What statement best describes the second law of thermodynamics

How energy changes or moves

What statement best describes what happens when heat is transferred from a toaster to bread

The thermal energy used to toast the bread changes to chemical energy

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